Calculation and Analysis of Sulfide Capacities for CaO-Al2O3-SiO2-MgO-TiO2 Slags Original Research Article

The empirical models of sulfide capacity calculated by traditional optical basicity do not consider the charge compensation of alkaline metal ions to Al3+ in the molten slags, so that the deviations between the calculated values and measured ones of sulfide capacity are inevitable. The relation between sulfide capacity and the corrected optical basicity put forward by Mills considering the charge compensation was investigated. Combined with the relation between sulfide capacity and temperatures, a novel and accurate calculation model of sulfide capacity was proposed, which was applied to calculate the sulfide capacities of CaO-Al2O1-SiO2-MgO and CaO-Al2O1-SiO2-MgO-TiO2 systems, where the sum of the CaO and MgO concentrations in the slags must be not lower than the Al2O3 concentration. It was also found that the calculated values were in a good agreement with the measured values, and the mean deviations were 2. 57% and 2. 65%, respectively.